ok, so coronavirus hit my state pretty hard and i got quarantined. since i cant go anywhere, my car has been sitting for almost 3 weeks. when i started it today, the vsa, traction control, and check engine all came on. when i opened the hood, there was nothing was out of the ordinary, so i think it may be build up of the brake dust or something. i drove around for a little while to check for abnormal noises and there wasn't anything other than the brakes because it had been sitting (which had gone away after a couple times slowing down). i dont have an obd2 , and i cant go anywhere for a diagnostic because all of the small businesses near me are closed down for the time being. what else should i check for? any help would be greatly appreciated.